John M. Hagan, Trevor L. Lloyd-Evans, Jonathan L. Atwood, The Relationship between Latitude and the Timing of Spring Migration of North American Landbirds, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 22, No. 2 (Apr. - Jun., 1991), pp. 129-136
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Hagan et al. (1991) studied this question.
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